Step 3.5 Flash

Creator

StepFun

Released

2026-02-02

Intelligence

37.8

Artificial Analysis Index

Coding

31.6

Artificial Analysis Index

In $/1M

$0.10

input tokens

Out $/1M

$0.30

output tokens

Blended $/1M

$0.15

3:1 blended

Speed

178

tokens / sec

Benchmark breakdown

Independent evaluation scores, normalized to 0–100.

GPQA Diamond
83
Humanity’s Last Exam
19
MMLU-Pro
SciCode
40
LiveCodeBench
MATH-500
AIME 2025
τ²-Bench (agentic)
94
Terminal-Bench Hard
27
IFBench
65
Via Artificial Analysis